Equity and Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Beginning Balance	$ 381,243	$ 365,135
Net Income	13,344	10,607
Amounts reported in other comprehensive income (loss)	5,376	(8,535)
Repurchases of common stock	(5,859)	0
Dividends, Common Stock	(4,227)	(4,000)
Share Issuance and Equity-Based Compensation Plans	1,545	1,635
Excess Tax Benefit From Stock Option Exercises	104	287
Ending Balance	391,526	365,129
Common Stock [Member]
Beginning Balance	13,288	13,301
Net Income	0	0
Amounts reported in other comprehensive income (loss)	0	0
Repurchases of common stock	(84)	0
Dividends, Common Stock	0	0
Share Issuance and Equity-Based Compensation Plans	32	31
Excess Tax Benefit From Stock Option Exercises	0	0
Ending Balance	13,236	13,332
Additional Paid-in Capital [Member]
Beginning Balance	106,333	99,056
Net Income	0	0
Amounts reported in other comprehensive income (loss)	0	0
Repurchases of common stock	0	0
Dividends, Common Stock	0	0
Share Issuance and Equity-Based Compensation Plans	1,513	1,604
Excess Tax Benefit From Stock Option Exercises	104	287
Ending Balance	107,950	100,947
Retained Earnings [Member]
Beginning Balance	326,740	299,524
Net Income	12,946	10,378
Amounts reported in other comprehensive income (loss)	0	0
Repurchases of common stock	(5,775)	0
Dividends, Common Stock	(4,227)	(4,000)
Share Issuance and Equity-Based Compensation Plans	0	0
Excess Tax Benefit From Stock Option Exercises	0	0
Ending Balance	329,684	305,902
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance	(73,316)	(54,406)
Net Income	0	0
Amounts reported in other comprehensive income (loss)	5,314	(8,565)
Repurchases of common stock	0	0
Dividends, Common Stock	0	0
Share Issuance and Equity-Based Compensation Plans	0	0
Excess Tax Benefit From Stock Option Exercises	0	0
Ending Balance	(68,002)	(62,971)
Noncontrolling Interest [Member]
Beginning Balance	8,198	7,660
Net Income	398	229
Amounts reported in other comprehensive income (loss)	62	30
Repurchases of common stock	0	0
Dividends, Common Stock	0	0
Share Issuance and Equity-Based Compensation Plans	0	0
Excess Tax Benefit From Stock Option Exercises	0	0
Ending Balance	$ 8,658	$ 7,919